PARIS (Reuters) - A man believed to have been an accomplice of the shooter who killed a policeman on Paris'Champs Elysees in April was placed under a formal investigation and remanded in custody, a judicial source said on Saturday (May 20).

His DNA was found on the weapon used by the shooter, identified as Karim Cheurfi, who had opened fire on a police vehicle parked on the famous avenue in Paris, killing one officer and injuring two others before being shot dead.

The man arrested was unknown to anti-terrorist services, the source said.